单项选择题

So little______ about mathematics that the lecture was completely beyond me.

A．I know
B．I knew
C．do I know
D．did I know
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单项选择题
The house is very big and beautiful. I think the rent must be______as that one.
A．three times more
B．as much three times
C．three times as much
D．as three times more
单项选择题
No matter how frequently ______, the works of Beethoven always attract large audiences.
A．performing
B．performed
C．to be performed
D．being performed
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